Added explicit Java 1.6 requirement (Prevents "Class not found" exception in Java 1.7)

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Fixed version requirement

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Fixed ranges again...

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Merge pull request #30 from synopsys-arc-oss/java-version-check

Explicit check of Java version via maven-enforcer